公开(公告)号：US20250130733A1

公开(公告)日：2025-04-24

申请号：US18489610

申请日：2023-10-18

Applicant: NetApp, Inc.

Inventor： V Ramakrishna Rao Yadala ,  Anoop Vijayan ,  Sohan Shetty ,  Murali Subramanian ,  Arun Kumar Selvam ,  Akhil Kaushik

IPC: G06F3/06

Abstract: A computer implemented method includes maintaining information indicative of whether a data replication relationship between a dataset associated with the local CG and a mirror copy of the dataset stored on a remote CG of a remote distributed storage system is in an in-synchronization (InSync) state or an out-of-synchronization (OOS) state, initiating a storage expansion process including a source expansion to create a new source volume as a member of the local CG and a destination expansion to create a new destination volume as a member of the remote CG, and initiating a data replication relationship expand to establish a data replication relationship for the new source volume and the new destination volume.

公开(公告)号：US12158824B2

公开(公告)日：2024-12-03

申请号：US17875837

申请日：2022-07-28

Applicant: NetApp, Inc.

Inventor： Anoop Vijayan ,  Akhil Kaushik ,  Sohan Shetty ,  Dhruvil Shah

IPC: G06F11/00 ,  G06F11/20

Abstract: Multi-site distributed storage systems and computer-implemented methods are described for improving a resumption time of input/output (I/O) operations during an automatic unplanned failover (AUFO). A computer-implemented method includes determining, with a second storage cluster, whether heartbeat information from one or more storage objects of a CG of a first set of CGs is received during a time period, determining an out of sync state for a data replication relationship between the CG of the first set of CGs and a mirrored CG of a second set of CGs when the heartbeat information is not received during the time period and sending a single bulk role change call with a cluster identifier from the second cluster to an external mediator to provide a role change from follower to leader in the second set of CGs.

公开(公告)号：US11934670B2

公开(公告)日：2024-03-19

申请号：US17219759

申请日：2021-03-31

Applicant: NetApp, Inc.

Inventor： Murali Subramanian ,  Akhil Kaushik ,  Anoop Vijayan ,  Omprakash Khandelwal ,  Arun Kumar Selvam

IPC: G06F3/06

CPC classification number: G06F3/0631 ,  G06F3/0604 ,  G06F3/067

Abstract: Systems and methods are described for efficiently performing various operations at the granularity of a consistency group (CG) within a cross-site storage solution. An example of one of the various operations includes an independent and parallel resynchronization approach that independently brings individual volumes of a CG to a steady state of in-synchronization (InSync), thereby contributing to scalability of CGs by supporting CGs having a large number of member volumes without requiring a change to the resynchronization process. Another example includes preserving dependent write-order consistency when a remote mirror copy goes out-of-synchronization (OOS) for any reason by driving all member volumes OOS responsive to any member volume becoming OOS. Yet another example includes independent creation of snapshots by member volumes to support efficient and on-demand creation by an application of a common snapshots of all or a subset of peered member volumes of a CG with which the application is associated.

公开(公告)号：US20220374321A1

公开(公告)日：2022-11-24

申请号：US17881381

申请日：2022-08-04

Applicant: NetApp, Inc.

Inventor： Akhil Kaushik ,  Anoop Vijayan

IPC: G06F11/20 ,  G06F11/30 ,  G06F11/14

Abstract: Systems and methods are described for a non-disruptive planned failover from a primary copy of data at a primary storage cluster to a mirror copy of the data at a cross-site secondary storage cluster without using an external mediator. According to an example, a planned failover feature of a multi-site distributed storage system provides an order of operations such that a primary copy of a first data center continues to serve I/O operations until a mirror copy of a second data center is ready. This planned failover feature improves functionality and efficiency of the distributed storage system by providing non-disruptiveness during planned failover without using an external mediator based on a primary storage cluster being selected as an authority to implement a state machine with a persistent configuration database to track a planned failover state for the planned failover.

公开(公告)号：US20220317896A1

公开(公告)日：2022-10-06

申请号：US17219740

申请日：2021-03-31

Applicant: NetApp, Inc.

Inventor： Arul Valan ,  Anoop Vijayan ,  Akhil Kaushik

IPC: G06F3/06

Abstract: Systems and methods for making a cross-site storage solution resilient towards mediator unavailability are provided. According to one embodiment, a stretched storage system is operable to bring a mediator associated with a primary and secondary distributed storage system back into the role of an arbitrator for peered consistency groups (CGs). A mediator reseed status indicator is maintained for multiple CGs to identify when the mediator's status information for a CG is stale. When the mediator becomes available and a local CG is identified as the subject of a mediator reseed process, the master node of the primary that hosts a master copy of a dataset for the local CG performs the reseed process, including: (i) causing relationship status information for the local CG to be updated on the mediator to the current state maintained by the primary; and (ii) resetting the mediator reseed status indicator.

公开(公告)号：US20250165177A1

公开(公告)日：2025-05-22

申请号：US19034412

申请日：2025-01-22

Applicant: NetApp, Inc.

Inventor： Vishal Thakur ,  Akhil Kaushik ,  Anoop Vijayan ,  Krishna Murthy Chandraiah Setty Narasingarayanapeta

IPC: G06F3/06

Abstract: In one embodiment, a computer-implemented method comprises establishing bi-directional synchronous replication between one or more storage objects of a primary storage site and one or more storage objects of a secondary storage site with each storage site having read/write access while maintaining zero recovery point objective (RPO) and Zero recovery time objective (RTO), initiating a resynchronization process due to a loss of the bi-directional synchronous replication between the one or more storage objects and the one or more storage objects, and performing the resynchronization process based on using inflight tracking replay and reconciliation between a first Op log metafile of the primary storage site and a second Op log metafile of the secondary storage site.

公开(公告)号：US12299310B2

公开(公告)日：2025-05-13

申请号：US18429911

申请日：2024-02-01

Applicant: NetApp, Inc.

Inventor： Anoop Vijayan ,  Akhil Kaushik ,  Sohan Shetty ,  Dhruvil Shah

IPC: G06F3/00 ,  G06F3/06

Abstract: Systems and methods are described for efficiently processing events related to a relationship between a primary copy of data at a primary storage system and a mirror copy of the data at a cross-site secondary storage system of a multi-site distributed storage system. According to an example, a mediator agent that is configured on both primary and secondary storage systems provides coordination and serialization for various events generated in the relationship. The multi-site distributed storage system performs actions based on the event processing such as performing a failover operation from the primary storage system to the secondary storage system or resynchronizing the relationship to ensure application protection and availability.

公开(公告)号：US20240036732A1

公开(公告)日：2024-02-01

申请号：US17875849

申请日：2022-07-28

Applicant: NetApp, Inc.

Inventor： Anoop Vijayan ,  Akhil Kaushik ,  Sohan Shetty ,  Dhruvil Shah

IPC: G06F3/06

CPC classification number: G06F3/0611 ,  G06F3/067 ,  G06F3/0655

Abstract: Multi-site distributed storage systems and computer-implemented methods are described for improving a resumption time for processing of input/output (I/O) operations during an automatic unplanned failover (AUFO). A first storage cluster includes a first set of consistency groups (CGs) and a second storage cluster includes a second mirrored set of CGs. A computer-implemented method includes prefetching, with a user space of the second storage cluster, configuration information from a replicated database prior to starting the AUFO workflow, sending the configuration information to a kernel space of the second storage cluster on a per CG level while queuing the AUFO workflow, and determining if any in progress workflows conflict with the AUFO workflow.

公开(公告)号：US11550679B2

公开(公告)日：2023-01-10

申请号：US17219812

申请日：2021-03-31

Applicant: NetApp, Inc.

Inventor： Akhil Kaushik ,  Anoop Vijayan ,  Omprakash Khandelwal

IPC: G06F11/00 ,  G06F11/20 ,  G06F3/06

Abstract: Systems and methods are described for a non-disruptive planned failover from a primary copy of data at a primary storage system to a mirror copy of the data at a cross-site secondary storage system. According to an example, a planned failover feature of a multi-site distributed storage system provides an order of operations such that a primary copy of a first data center continues to serve I/O operations until a mirror copy of a second data center is ready. This planned failover feature improves functionality and efficiency of the distributed storage system by providing non-disruptiveness during planned failover—even if various failures occur. The planned failover feature also includes a persistent fence to avoid serving I/O operations during a timing window when both primary data storage and secondary data storage are attempting to have a master role to serve I/O operations and this avoids a split-brain situation.

公开(公告)号：US20220317897A1

公开(公告)日：2022-10-06

申请号：US17219759

申请日：2021-03-31

Applicant: NetApp, Inc.

Inventor： MURALI SUBRAMANIAN ,  Akhil Kaushik ,  Anoop Vijayan ,  Omprakash Khandelwal ,  Arun Kumar Selvam

IPC: G06F3/06

Abstract: Systems and methods are described for efficiently performing various operations at the granularity of a consistency group (CG) within a cross-site storage solution. An example of one of the various operations includes an independent and parallel resynchronization approach that independently brings individual volumes of a CG to a steady state of in-synchronization (InSync), thereby contributing to scalability of CGs by supporting CGs having a large number of member volumes without requiring a change to the resynchronization process. Another example includes preserving dependent write-order consistency when a remote mirror copy goes out-of-synchronization (OOS) for any reason by driving all member volumes OOS responsive to any member volume becoming OOS. Yet another example includes independent creation of snapshots by member volumes to support efficient and on-demand creation by an application of a common snapshots of all or a subset of peered member volumes of a CG with which the application is associated.